Solve the problem.A formula for calculating the distance, d, one can see from an airplane to the horizon on a clear day is 
where x is the altitude of the plane in feet and d is given in miles. How far can one see in a plane flying at 20,000 feet? Round your answer to the nearest tenth mile, if necessary.
A. 12,200 mi
B. 1220 mi
C. 172.5 mi
D. 156.2 mi
Answer: C
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 
B. -4
C. 2
D. - 
Find at least three nonzero terms [including a0, at least two cosine terms (if they are not all zero) and at least two sine terms (if they are not all zero)] of the Fourier series for the given function.f(x) = 
A. f(x) = 
+ 
- 
(sin x - sin 2x + . . .)
B. f(x) = 
+ 
- 
(sin x + sin 2x + . . .)
C. f(x) = 
+ 
+ 
(sin x - sin 2x + . . .)
D. f(x) = 
+ 
+ 
(sin x + sin 2x + . . .)
Solve the problem.Find the face value (to the nearest thousand dollars) of the 30-year zero-coupon bond at 5.9% (compounded semiannually) with a price of $6990.
A. $40,000 B. $55,000 C. $55,800 D. $40,500
Solve the problem.A company has 204 sales representatives, each to be assigned to one of four marketing teams. If the first team is to have three times as many members as the second team and the third team is to have twice as many members as the fourth team, how can the members be distributed among the teams? (Let x denote the number of members assigned to the first team, y the number assigned to the second team, z the number assigned to the third team, and w the number assigned to the fourth team. Let w be the parameter.)
A. x = 102 - 3w, y = 34 - w, z = 68 + 3w, 0 ? w ? 34 B. x = 204 - 3w, y = 68 - w, z = 3w - 68, 0 ? w ? 68 C. x = 153 - 9w/4, y = 51 - 3w/4, z = 2w, 0 ? w ? 68 D. x = 51 - 3w/4, y = 17 - w/4, z = 2w, 0 ? w ? 34